How to analyzing rental deals without a pro account

[Marvin Hudson]

Good afternoon all,

What is a good resource or formula to use to analyze rental deals?  I know the best way to analyze deals would be to upgrade to a Pro account but that is not feasible for me right now.  I would like to get some practice at work while we are slow.  Is there a website with a formula that I could use?  Also, what are the most important numbers to use?  I know rent price, insurance, utility, taxes; anything else?  Thank you guys for your time and sorry about all the questions.